Silencing device for typewriters



March 1 1927. 1,619,602

R. G. DANIEL SILENC ING DEVICE FOR TYPEWRITERS Original Filed Nov. 5,1923 2 sh ts-sheet 1 8.6. DAN/EL.

#TW Y.

March 1 1927 1,619,602

R. G. DANIEL SILENCING DEVICE FOR TYPEWRITERS Original Filed Nov. 5,1923 2 Sheets-Sheet 2 INVENTOR.

F) G. DAN/EL Patented Mar. 1, 1927.

UNITED STATES PATENT OFFICE,

-BOYAL G. DANIEL, 01 DENVER, conommo, ASSIGNOR TO trim'onnnnwoon TYPE-WBITEB COMPANY, NEW YORK, IN. Y.,'A CORPORATION OF DELAWARE.

SILENCING DEVICE FOR TYPEWRITERS.

Ben led for abandoned application Serial No. 672,589, filed November 3,1923. This application filed June 29,

a 1926. Serial No. 119,775.

This invention relates to silencing devices for typewriters or similarmachines and its primary object is to provide a cover of simpleconstruction which encloses the portion of the platen of a typewriter atwhich. the paper is struck by the keys and thereby 1 deadens the soundof the contact which is frequently a source of annoyance to personsworking or conversing in the vicinity of the machine.

In order to effectively mufiie the sound made by the -keys in theoperation of the machine, it is essential that the cover which encasesthe place at which the keys make their impression on the paper, beextended to close the openings which expose the keys at the top and thefront of the frame of the machine, and it is another object of theinvention to provide a sound deadening contrivance of the abovedescribed character which is readil detached from the machine to whichit is applied, to give access to the keys and the therewith co-operatingparts of the mechanism, for cleaning or repairs.

It is evident that the form of the sound deadening device must be variedin order to adapt the invention for use on different makes oftypewriters and it is a further object of the invention to provide acover of the kind hereinabove described which is capable of followingthe upward movement of the platen in machines in which the operatorchanges from characters of the lower case to characters of the uppercase by adjustment of the platen instead of by shifting the basket ofkeys as in other machines.

It is well known that many machines especially those of modern type,have sound deadening covers or panels to enclose the sides and bottom ofthe frame and I desire it understood that my invention does notinterfere with the application of such devices but is in fact, anauxiliary thereto in that it aids to completely muflie the sounds madein the operation of the machine.

An embodiment of my invention in a plurality of forms adapting it foruse in connection with different makes of typewriting machines, has beenillustrated in the accompanying drawings in which like characters ofreference designate corresponding parts throughout the several views andin which- F igure 1 represents a front elevation of a typewritingmachine'to which my invention is applied;' Figure 2-, the same;

Figure 3, a. fragmentary horizontal section taken on the line 3-3,Figure 1;

Figure 4, a fragmentary sectlon along the line 1-4, Figure 2;

Figure 5, a fragmentary transverse section taken along the line 55,Figure 1, and drawn to an enlarged scale, and

Figures 6 and 7, similar sections showing a partially broken top view ofvariations in the form of the cover, required to adapt them to machinesof different-types.

The machine chosen to illustrate the em bodimentof my invention inFigures 1 to 5 inclusive, is that known by the trade-name Royal, whilethe machines shown in outline in Figures 6 and 7 are known in traderespectively under the names of- Remington and L. C. Smith.

The above mentioned machines were selected merely as beingrepresentative of the more popular types at present in use and it willbe readily understood that other changes required to adapt the cover foruse on other types of machines, will fall within the spirit and scope ofthe invention as defined in the hereunto appended claims.

Referring to the drawings, the reference characters 5 designate theframe of the typewriting machine having connected openings 6 and 7 inits top and front to expose the basket of pivoted keys one of which hasbeen shown at 8 in Figure 5.

The numeral 9 designates the platen or feed roller on which the paperrests to receive the in'ipressions of the keys, and 10 designates theribbon which supplies the ink for the impressions.

In typewriters of the kind illustrated in Figures 1 to 5, the ribbon iswound on spools 12 mounted ontop of the frame and at opposite sides ofthe point 13 at which the keys strike the platen. i

The cover of my invention, designated in its entirety by the referencecharacter 14 comprises an angular body portion 15 adapted to close theopenings 6 and 7 of the frame of the machine.

The front part '15 of the body port on 5 is flat to extend evenly alongthe forward side of the frame, and the substantially horizontal upperpart 15 of the same is preferably bulged to afford work ng room forthe-keys in their movement to and from the point 13 at which they hitthe paper on the platen.

slanting rearwardly from the body por-' tion of the shield is a member16 of reduced width which curves over the platen at the central point ofthe machine at which the types are impressed upon the paper through themedium of the inked ribbon.- The member 16 is flanged as at 16 toenclose the space over which it extends and it has an opening 16 closedby a pane 17 of transparent material through which the operator canobserve the work.

The transparent pane is preferably made of glass or other similarmaterial and it is set in a detachable frame 18 so that it may bereadily removed if necessary. I

In machines of the type of those illustrated in Figures 1 and 6, inwhich the platen is raised to change the line of writing from the lowercase type to the upper case type on the heads of the he s, the member 16is hinged as at 19 to ena 1e it to follow the movement of the platen 9and its flanges overlap the sides of the body member of the cover asindicated at 20, so that even though it moves upwardly with the platen,the space covered by the member remains completely enclosed.

For machines in which the ribbon spools are mounted on top of the frame,the cover is provided with narrow slots 21 through which the ribbonpasses.

It is desirable that the flanges of the member extend as near to thesurface of the platen as is possible without interfering with themovement of the paper, so that the paper together with the carbon andcopy sheets will practically fill the space between the platen and thecover and thereby aid in deadening the sound made by the keys when theystrike the paper on the platen through the medium of the ribbon.

The shield is fastened on the frame of the typewriter by screws 22 orother suitable means and it is preferably provided with a lining 23 offelt or other sound-insulating material which not only aids materiallyin deadening the sound but which also functions as a packing to insurean air-tight contact of the shield with the frame.

The shield shown in Figure 7 is solid in that its platen embracingmember 16 is a rigid and preferably integral part of the body member 15,the shield being particu- ;arly adapted for use on machines in which .heplaten is not lifted, but the type-changing adjustment is accomplishedby an upward movement of the entire assemblage of pivoted keys commonlyknown as the hasket.

Having thus described my invention, what I claim and desire to secure byLetters Patcnt is 1. A silencing device for typewriters comprising incombination with a machine having a frame, and a platen, a coverexclusively enclosing a portion of the surface of the platen around andincluding the point at which the impressions are produced byaction ofthe keys.

2. A silencing device for typewriters comprising in combination with amachine having a frame, and an upwardly movable platen, a hinged coverexclusively enclosing a portion of the surface of the platen, around andincluding the point at which the impressions are produced by action ofthe keys.

3. A silencing device for typewriters comprising in combination with amachine having a frame, and a platen, a partially transparent coverexclusively enclosing the portion of the surface of the platen aroundand including the point at which the impressions are produced by actionof the keys.

4. A silencing device for typewriters comprising in combination with amachine including a partially open frame, and an upwardly adjustableplaten, a cover having a movable, flanged and transparent memberenclosing the portion of the platen at which the impressions areproduced by action of the keys.

5. A silencing device for typewriters comprising in combination with amachine having a partially open frame, and a platen, a cover closing anopening of the frame above the keys, and exclusively enclosing a portionof the surface of the platen around and including the point at which theimpressions are produced by the action of the keys.

ii. A silencing device for typewriters comprising in combination with amachine having a partially open frame, and a platen, a cover closingopenings of the frame at the top and the front thereof, for exelusivelvenclosing a portion of the-surface of the platen around and includingthe point at which the impressions are produced by action of the keys.

Z. A silencing device for typewriters comprising in com )ination with amachine including a partially open frame and an upwardl y adjustableplaten, a cover closing the frame, and enclosing the portion of theplaten at which the impressions are produced by action of the keys, thecover being partially movable to follow the upward move ment of theplaten 8. A silencing device for typewriters comprising in combinationwith a machine including a partially open frame and an upillil named:

wardly adjustable platen, a cover having a I bod member closin theframe, and a rela tive y movable mem bers enclosing the portion of theplaten at which the impressions are produced by action of the keys.

9. A silencin device for typewriters comprising in com ination with amachine including a partially open frame and'an upwardly adjustableplaten, .a cover having a fixed body member closing an opening of a theframe above the keys, and a hinged member enclosing the portion of theplaten at which the impressions are produced by action of the keys.

10.A silencing device for typewriters comprlsing m combinatlon with amachine including a partially open frame and a platen, a cover havinganangular member closing openings at the front and top of the frame, andan upwardly ranging member exclusively enclosing a portion of thesurface of the platen around and including the point at which theimpressions are produced y action of the keys.

In testimony whereof I have aflixed my signature;

ROYAL G. DANIEL

